Malicious PDF — malware analysis report

Static analysis result for SHA-256 045a03ea1b336aab…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 07:52:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4c3a8f47278c17fa5d2c27e4d951bfdc SHA-1: 6b02e9f5f6f2cbad5bdd0c99ce49028b81943675 SHA-256: 045a03ea1b336aabbedc992ad34a10b8ccc0ef2f9451380ce7eb7adadda800d9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/free-spins-coin-master-blogspot-game-hack PDF link annotation
    • http://mtsn-baranti.com/perpus/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-get-scar-free-in-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/best-free-script-executor-roblox-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/hack-para-counter-blox-roblox-offensive-download_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-items-on-roblox-in-a-game_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-zone-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-get-free-robux-youtube-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/cheat-code-sonic-new-map-roblox_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-earn-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/cheat-engine-roblox-bypass-2021-june_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-robux-no-hack-no-survey-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fe1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE1 23268 bytes
SHA-256: 862396cd702a376cce0588ee36505fdb8327c2c75520a3adb62eead512879009
font_01_sfnt_off00006464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6464 18464 bytes
SHA-256: cbb231600960fb01f8bf75e8d05c0400c1d923e50dae77b7055f9c2ab978b14e

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